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The problem context involves a scenario where we have a list of pairs, and we need to determine the number of unique pairs. A pair is considered unique based on the combination of the first and second elements. This is a common problem in data structures and algorithms, particularly when dealing with sets.
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The solution approach involves using a HashSet in Java, which is a collection that does not allow duplicate elements. We iterate through the list of pairs, and for each pair, we add it to the HashSet in a specific format (first element + '_' + second element). Since a HashSet only allows unique elements, any duplicate pairs will not be added. We then print the size of the HashSet after each addition, which gives us the number of unique pairs up to that point.
/**
*
*/
package com.javaaid.hackerrank.solutions.languages.java.datastructures;
import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;
/**
*
*/
public class JavaHashset {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int t = sc.nextInt();
String[] pair_left = new String[t];
String[] pair_right = new String[t];
for (int i = 0; i < t; i++) {
pair_left[i] = sc.next();
pair_right[i] = sc.next();
}
// Write your code here
Set set = new HashSet();
for (int i = 0; i < t; i++) {
set.add(pair_left[i] + "_" + pair_right[i]);
System.out.println(set.size());
}
sc.close();
}
}
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